Overdevest 2011.

Trial name or title	Verbiest
Methods	Multi‐centre randomised controlled trial
Participants	Patients (> 50 years of age) with ≥ 3 months of complaints of neurogenic intermittent claudication and considering surgical treatment are eligible for inclusion
Interventions	Prolonged conservative treatment vs surgery
Outcomes	Primary Zurich Claudication Questionnaire Shuttle walking test Secondary Demographic data Neurological/clinical investigations Modified Roland Disabilty Questionnaire Visual analogue scale (VAS) for pain in back and leg Perceived recovery Short Form (SF)‐36/30 Societal costs and utilities (European Organization for Research and Treatment of Cancer core quality of life questionnaire (EuroQol‐5D), visual analogue scale) Complications Reoperation incidence Operative data Imaging findings Participant's, neurologist’s, neurosurgeon’s, general practitioner's (GP’s) preferences at baseline Timed‐up and go test Short physical performance battery (SPPB) MicroFET (Force Evaluating and Testing) Grip strength Accelerometry
Starting date	N/A
Contact information
Notes	NTR2216